The seven angels with the seven last plagues.
Revelation 15:1 And I saw another sign in heaven, great and marvelous, seven angels having the seven last plagues; for in them is filled up the wrath of God. Revelation 15:2 And I saw as it were a sea of glass mingled with fire: and them that had gained the victory over the beast, [and] over his image, and over his mark, [and] over the number of his name, stand on the sea of glass, having the harps of God.
The song of them that overcome the beast.
Revelation 15:3 And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvelous [are] thy works, Lord God Almighty; just and true [are] thy ways, thou King of saints. Revelation 15:4 Who shall not fear thee, O Lord, and glorify thy name? for [thou] only [art] holy: for all nations shall come and worship before thee; for thy judgments are made manifest. Revelation 15:5 And after that I looked, and behold, the temple of the tabernacle of the testimony in heaven was opened: Revelation 15:6 And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.
The seven vials full of the wrath of God.
Revelation 15:7 And one of the four living beings gave to the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever. Revelation 15:8 And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled.